Operational amplifier capable of improving slew rate and related method thereof
An operational amplifier, slew rate technology, applied in DC-coupled DC amplifiers, differential amplifiers, instruments, etc., can solve problems such as increasing circuit area and power consumption
Inactive Publication Date: 2013-01-02
NOVATEK MICROELECTRONICS CORP
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Problems solved by technology
[0009] The prior art generally increases the bias current I of the amplifying circuit T1 To increase the internal slew rate of the operational amplifier, however, this will not only increase the circuit area (for example: increase the area of the bias transistor), but will also result in additional power consumption
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[0040] Please refer to Figure 4 , Figure 4It is a schematic diagram of a process 40 for increasing the slew rate of the operational amplifier in the present invention. An operational amplifier generally includes an amplification stage circuit and an output stage circuit. The amplifier stage circuit is used to increase the gain of the operational amplifier (Gain), and the output stage circuit is used to drive the capacitive or resistive load connected to the operational amplifier. Process 40 includes the following steps:
[0041] Step 400: start.
[0042] Step 410: Generate a first bias current to the amplifier circuit.
[0043] Step 420: Generate a second bias current to the output stage circuit.
[0044] Step 430: Redistribute the magnitudes of the first bias current and the second bias current according to a control signal, so as to increase the slew rate of the operational amplifier.
[0045] Step 440: end.
[0046] According to the process 40, the present inventio...
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The invention relates to an operational amplifier capable of improving the slew rate. The operational amplifier comprises a first current generator, a second current generator, a amplification-stage circuit, an output-stage circuit and a bias current distribution unit, wherein the first current generator is used for generating a first bias current; the second current generator is used for generating a second bias current; the amplification-stage circuit is coupled with the first current generator and used for generating an amplification signal according to an input signal; the output-stage circuit is coupled with the second current generator and the amplification-stage circuit and used for generating an output signal according to the amplification signal; and the bias current distribution unit is coupled with the first current generator, the second current generator, the amplification-stage circuit and the output-stage circuit and used for distributing the first bias current and the second bias current according to the control signal so as to improve the slew rate of the operational amplifier, wherein the second bias current is greater than the first bias current.
Description
technical field [0001] The present invention refers to an operational amplifier capable of increasing the slew rate and its related method, especially to an operational amplifier and an operational amplifier capable of improving the drive capability of the amplifier circuit by distributing the bias current of the amplifier circuit and the drive current of the output stage circuit. its related methods. Background technique [0002] The operational amplifier is a basic building block of circuits with a wide variety of applications. Circuit designers can often use operational amplifiers to implement many different operational functions. For example, in the driving circuit of the liquid crystal display, the operational amplifier can be used as an output buffer, which charges and discharges the load (that is, the liquid crystal) according to the analog signal output by the previous digital-to-analog converter to drive the upper phase of the liquid crystal display. the correspon...
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IPC IPC(8): H03F3/45G09G3/36
Inventor 陈季廷
Owner NOVATEK MICROELECTRONICS CORP